Kärrgruvan is a particularly large historic iron ore mine. In the area are lots of other smaller mines, and there is a short round-trip path that passes by some of them. Here is also a shelter with a fireplace and picnic tables. There is an outhouse/privy, and if you follow the signs there is a simple drinking water well along the path to the north of the shelter.
When I visited the firewood had run out and the water well had only a very low water level in it, but the water did look reasonably ok.